PTFE/polyamide thin-film composite membranes using PTFE films modified with ethylene diamine polymer and interfacial polymerization: Preparation and pervaporation application

Yu, Chung-Hao; Kusumawardhana, Irdham; Lai, Juin‐Yih; Liu, Ying‐Ling

doi:10.1016/j.jcis.2009.03.052

Cited by 49 publications

(15 citation statements)

References 32 publications

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“…In particular, porous PTFE membranes have found special importance in water treatment [1], separators of lithium-ion batteries [1,2], pervaporation [3], and blood purification [4]. However, the presence of strong C-F bonding and water repellence makes the application of PTFE membranes in water treatment field less competitive because of the rather low water flux.…”

Section: Introductionmentioning

confidence: 99%

Surface engineering and self-cleaning properties of the novel TiO2/PAA/PTFE ultrafiltration membranes

et al. 2016

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Immobilization of nano-scaled TiO 2 onto polymeric ultrafiltration (UF) membrane offers desirable antifouling and self-cleaning properties to the membrane, which is practical in wastewater purification only if the mechanical strength and long-term self-cleaning durability are realized. This paper reported the surface roughness, mechanical properties, thermal stability, and recycling selfcleaning performance of the novel TiO 2 /PAA/PTFE UF membranes, which were coated via an innovative plasmaintensified coating strategy. Through careful characterizations, the enhanced engineering properties and the selfcleaning performance were correlated with the surface chemical composition and the creative coating technique. In the recycling photocatalytic self-cleaning tests in photodegradation of methylene blue (MB) solution, about 90 % MB photocatalytic capability of TiO 2 /PAA/PTFE composite membranes could be recovered with simple hydraulic cleaning combined with UV irradiation. The mechanical properties and thermal stability of TiO 2 /PAA/ PTFE also satisfy the practical application in water and wastewater treatments, despite that the original engineering properties were slightly influenced by PAA grafting and TiO 2 coating. The changed properties of the composite UF membrane relative to PTFE are reasonably attributed to the variation of the surface chemical species and chemical bonding, as well as the thickness and evenness of the surface functional layers.

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Section: Introductionmentioning

confidence: 99%

Surface engineering and self-cleaning properties of the novel TiO2/PAA/PTFE ultrafiltration membranes

et al. 2016

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“…Yu et al13 attempted to enhance the strength of the TFC functional layer adhered onto the polytetrafluoroethylene substrate after surface‐modified ethylene diamine (EDA), which reacted with trimesoyl chloride during the IP procedure. In order to improve the structural stability, Ma et al14 used carbopol (CP) as the intermediate layer to bridge the chitosan active layer and the polyacrylonitrile support membrane.…”

Section: Introductionmentioning

confidence: 99%

Feasible Preparation of a Thin‐Film Composite Nanofiltration (TFC NF) Membrane with Enhanced Skin–Substrate Adhesion and Compaction Resistance: In Situ Construction of Rigid–Flexible Polymer Composited Microspheres (CPs) in the Casting Solution

Lian

Xie

Shi

et al. 2020

Macro Materials & Eng

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Novel microspheres (CPs) composited by rigid and flexible polymers are synthesized and embedded in the supporting membranes to enhance both the skin–substrate adhesion and compaction resistance of the thin‐film composite (TFC) nanofiltration membranes. The CPs are in situ formed in the casting solution after the rigid poly(p‐phenylene terephthamide) (PPTA) is produced in the flexible poly(m‐phenylene isophthalamide) (PMIA) solution. Then the PPTA/PMIA in situ blending membranes are prepared by using the NIPs method, and the TFC NF membranes are fabricated via interfacial polymerization on them. The CPs are characterized via polarizing microscopy and TEM. The surface morphology and chemical composition of the blended membranes are characterized by using FESEM, AFM, FTIR, and WCA, respectively. As the results show, the supporting membrane with higher PPTA content exhibits higher permeability, thermal stability, and compaction resistance. Moreover, the adhesion strength between the TFC functional layer and the supporting membrane is improved significantly. It is proposed that this improvement can be attributed to the CPs that are exposed on the top surface of the supporting membrane, which leads to a great enhancement because of the anchoring effect between the functional layer and the CPs.

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“…Currently, membrane fabrication methods like interfacial polymerization, plasma polymerization, atom transfer radical polymerization (ATRP), dip-coating and also other methods have been applied to the preparation of ultrathin pervaporation membranes. [22][23][24][25] It can be concluded that the dramatic decrease of selective layer thickness has been achieved mostly because small molecules are used instead of polymers, like PDMS, as lm forming monomers in most of these methods. Therefore, in our previous study, Zhang et al 26 have reported the preparation of thin high-ux poly(vinyltriethoxysilane) (PVTES) membranes with vinyltriethoxysilane (VTES) monomers for ethanol recovery, which possessed a ux over 10 000 g m À2 h…”

Section: Introductionmentioning

confidence: 99%

Copolymerization modification of poly(vinyltriethoxysilane) membranes for ethanol recovery by pervaporation

et al. 2017

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In this study, a copolymerization modification method is used to modify the rigid structure of a high-flux poly(vinyltriethoxysilane) (PVTES) membrane, which was prepared from VTES monomers in our previous work, to further enhance its separation factor. A value of R/Si, which could characterize the density of organic groups and the chain flexibility in membrane materials, is introduced here to guide the selection of modification chemicals. Modifiers with different polymerization degree but the same flexible chain unit (DMDES, HSO and PDMS) are chosen to be copolymerized with PVTES. Analysis results show that the PVTES-HSO membrane possesses lower thickness, higher amount of hydrophobic groups, and an inner structure with greater chain flexibility and lower crystallinity, leading to the best pervaporation (PV) performance among these modified membranes, which is much better than the original PVTES membrane. Furthermore, PVTES-HSO membranes with different R/Si values are prepared to optimize their PV performance. And the optimal PVTES-HSO membrane (R/Si ¼ 1.4) shows the best performance with the separation factor of 6.6 and flux up to 8160 g m À2 h À1 when separating 9 wt% ethanol aqueous solution at 35 C.

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PTFE/polyamide thin-film composite membranes using PTFE films modified with ethylene diamine polymer and interfacial polymerization: Preparation and pervaporation application

Cited by 49 publications

References 32 publications

Surface engineering and self-cleaning properties of the novel TiO2/PAA/PTFE ultrafiltration membranes

Surface engineering and self-cleaning properties of the novel TiO2/PAA/PTFE ultrafiltration membranes

Feasible Preparation of a Thin‐Film Composite Nanofiltration (TFC NF) Membrane with Enhanced Skin–Substrate Adhesion and Compaction Resistance: In Situ Construction of Rigid–Flexible Polymer Composited Microspheres (CPs) in the Casting Solution

Copolymerization modification of poly(vinyltriethoxysilane) membranes for ethanol recovery by pervaporation

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